Consolidation agent and method

Details Consolidation agent and method Consolidation agent and method

E - Fixed Constructions

21

B

E21B 43/22 (2006.01) E21B 29/00 (2006.01) E21B 43/02 (2006.01)

Patent

CA 2056855

F-5983-L(PAC) ABSTRACT OF THE INVENTION A sand consolidation method is provided for use in a borehole having an unconsolidated or loosely consolidated oil or gas reservoir which is likely to introduce substantial amounts of sand into the borehole and cause caving. After perforating the borehole's casing at an interval of the formation where sand will be produced, an aqueous solution of potassium silicate is injected into said interval. Thereafter, an alcoholic solution of hydrated calcium chloride is injected into the interval. A permeability retaining calcium silicate cement is formed in the interval. Injection of the potassium silicate and hydrated calcium chloride solutions is continued until the interval has been consolidated by the calcium silicate cement to an extent sufficient to prevent sand migration and thereby prevent caving.

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